Materials Literature
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Abstract An improved correction model for quantitative electron probe microanalysis, based on modifications of the Gaussian ϕ(ϱ) approach, originally introduced by Packwood and Brown , is presented. The improvements consist of better equations for the input parameters of this model which have been obtained by fitting…
The polarized infrared (400-4 000 cm-1) absorption spectra of single crystals of the α form of (BEDT-TTF)2I3 are reported for the high temperature conducting phase at T = 300 K and for the low temperature semiconducting one at T = 20 K. For comparison and to supplement the already available data, the conductivity spec…
The way in which surface tension acts as a singular perturbation to destroy the continuous family of needle-crystal solutions of the steady-state growth equations is analyzed in detail for two local models of solidification. All calculations are performed in the limit of small surface tension or, equivalently, small v…
This report contains papers on research with boron-rich solids. These papers main describe the following topics: electronic structure; electronic and optical properties; superconductivity; crystal structure; magnetic properties; vibrational properties; thermal and elastic properties; phase diagrams; materials; prepara…
Abstract The X-ray crystal structure analysis of a sulfur containing π-donor molecule, bis(ethylenedithio)tetrathiafulvalene, (BEDT-TTF) shows that the BEDT-TTF molecule is nonplanar and that the crystal is composed of pairs of BEDT-TTF.
Abstract Low-energy electron diffraction (LEED) is a technique for investigating the crystallography of surfaces and overlayers adsorbed on surfaces. This article describes the principles of diffraction from surfaces, and elucidates the method of sample preparation to achieve diffraction patterns. The article describe…
Introduction Basis of Mass Balance Method Calculation of Removals External Sources Data from Examination of Oxide Layers on Primary Circuit Components Completion of Mass Balances by Predicting Nett Releases from Circuit Alloys Estimation of Nett Corrosion Releases from Chromium Enrichment Preliminary Discussion of Cob…
Neutron powder diffraction data of cubic CsNO 2 at room temperature (space group Pm 3 m , a = 4.389 Å) are analyzed with several models for the orientationally disordered NO 2 group. The density distribution of O and N atoms are expanded on spherical shells with cubic harmonics. The density of the O atoms is concentra…
Abstract Importance of crevices formed between tubes and tube plate for the operational behaviour of heat exchangers . It must be guaranteed by construction and manufacture of heat exchangers that primary and secondary medium are completely separated from each other. When this requirement is fullfilled, the operationa…
Wet adhesion of paint film on Zn-Ni alloy electroplated steel sheet is significantly affected by the metal ion balance in phosphate solution. Variation of the Ni++ ratio in phosphate solution changes the Ni content of phosphate film formed. As the Ni content of phosphate film increases, the wet adhesion of paint film…
Single crystals of optical quality of l -glutamic acid chloride, bromide and iodide with dimensions up to 80 × 30 × 20 mm have been grown from aqueous solutions by controlled lowering of temperature from 315 to 300 K. The isotypic crystals possess quite similar physical properties. Strong anisotropic effects are found…
A theoretical interpretation is made of the magnetic susceptibilities of the dinuclear rare-earth complexes of phthalocyanine [RE2(pc)(dpm)4][where RE = Sm3+–Yb3+ and Y3+, pc = phthalocyaninato(2-) and dpm = 2,2,6,6-tetramethylheptane-3,5-dionato(1-)] measured from 77 to 300 K. The tendencies of the magnetic moments t…
Abstract The diffraction pattern of any material contains structural and chemical property information that can be extracted using radial distribution function analysis. This article provides an introduction to the technique and presents several examples highlighting various ways in which it can be used. It begins wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT13C-nmr Studies of CedranolidesP. Joseph-Nathan, A. Gutiérrez, J. D. Hernández, L. U. Román, and R. L. SantillanCite this: J. Nat. Prod. 1986, 49, 1, 79–89Publication Date (Print):January 1, 1986Publication History Published online1 July 2004Published inissue 1 January 1986h…
Materials deform faster under stress in the presence of irradiation by a process known as irradiation creep. This phenomenon is important to reactor design and has been the subject of a large number of experimental and theoretical investigations. This purpose of this work is to review the recent experimental results t…
The adsorption of nitrogen over an alumina-supported cobalt catalyst has been studied by means of infrared spectroscopy. An infrared band due to dinitrogen species adsorbed over the catalyst appears at 2214 cm–1 at 93 K. The band shifts to lower frequency by ca. 20 cm–1 in the presence of strongly adsorbed hydrogen, w…
The impurity diffusion coefficient of tin in γ-iron has been determined by the serial sectioning method with the radioactive tracer 113Sn in the temperature range between 1197 and 1653 K. The temperature dependence of the diffusion coefficient shows the linear Arrhenius relationship, expressed byD=(0.845−0.119+0.141)×…
Temperature dependence of electrical conductivity has been studied for hot pressed AlN ceramic having different volume percentage of porosity (0.2 to 15 %) in the temperature range (500 K to 950 K). It has been observed that electrical conductivity decreases by two orders of magnitude as the volume percentage of poros…
For a nematic solution of polydisperse rigid rods the osmotic pressure is proved to be independent of the length distribution and proportional simply to the total number density. This rule holds in the gaussian approximation to the Onsager theory. Its accuracy is demonstrated for bidisperse systems.
SummaryThe surface roughening of commercial purity aluminium for lithographic printing plates is commonly carried out by A. C. etching in dilute acids to produce a fairly uniform distribution of small pits. The uniformity of the etching process is affected by metal structure and composition.Techniques developed to sho…